Support `cpuperiod` and `cpuquota` container limits for build

[derlin]

Docker API v1.19 (see changelog introduced two new arguments to build:

POST /build accepts cpuperiod and cpuquota options

It would be great to update the container_limits valid keys in BuildApiMixin to introduce them.

[derlin]

@milas, @glours can someone please have a look? It's been opened since April.